This study aims to: (1) develop assessment tools of science process skills in Natural Sciences learning of junior high school; (2) formulate appropriate assessment tools of science process skills in Natural Sciences learning. Developmental approach was employed to develop assessment tools of science process skills in Natural Sciences subject learning of junior high school. The research procedures applied 4-D (define, design, develop, disseminate) development model. The assessment tool formulated was tested in Junior High School SMP Negeri 1 Gorontalo during odd semester of 2018/2019 academic year. The result shows that the assessment tool is considered appropriate, valid, effective, and practical to measure seventh grade students’ learning outcome of junior high school; validated by expert validator and Natural Sciences teachers.
Assessment Tools Science Process Skills , Natural Sciences Learning